National Security

Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, condemned the recent killing of NATO personnel by rogue Afghan troops as a “very serious threat” to the campaign in Afghanistan, according to the Associated Press.

"We're all seized with (the) problem," Dempsey said, after discussing the issue with NATO officials on Sunday. "You can't whitewash it. We can't convince ourselves that we just have to work harder to get through it. Something has to change."

Dempsey’s comments came as several attacks took place in recent days. On Sunday, four Americans were killed at a checkpoint at the hands of Afghan police.